OCR

16 now TO MAKE MAGIC TOYS.
oted on the bar upholding the ship. The action is as $01-
lows : The main support imparts a rolling movement, and
the two rods by their alternate rise and fall give the pitch
and toss movement. To cover the works, a cloth painted
with green, blue and white to represent waves in agitation
is fastened, without being drawn tight all round to the
edges of the case,’ and in the center, all round to the hull
of the ship about the water line. If this cloth be duly stiff
with the paint it will heave up sharply enough, and keep
as rigid as if sustained by water beneath. The ship is a
mode] of a barque, or full-rigged ship, which you can make
from any good picture. You need not make it very solidly,
as it is not to dare the battle and the breeze. Make the
sails of cardboard, painting on the reef- points ; fasten the
thread ropes wherever they touch masts, spars, and hull,
with a tiny dab of sealing wax; paint the whole with gum-
water and india-ink.
The Prancing Horse.
THE center of gravity in a body is that part about which
all the other parts equally balance each other. In balanc-
ing a stick upon the finger, or upon the chin, it is necessa.-..
ry only to keep the chin or finger exactly under the point
which is called the center of gravity. Cut out a wooden
figure of a. horse, and having fixed a curved iron wire to
the under part of the body, place a small ball of lead upon
it. Place the hind legs of the horse on the table. and it
will rock to and fro. If the ball were removed the horse
would immediately tumble, because unsupported. the